FREDERIK, Prins der Nederlanden (1797-1881). Signed letter to P.J. Landrij (1802-1865) regarding festivities on November 17th 1863, dated Huis de Pauw (Wassenaar), Sept. 23rd 1863. Written in a legible hand on 1 side of a folded 4° sheet of paper. With the or. envelope w. (faded) wax seal. -- Added: Id. Letter to the heirs of P.J. Landrij (1802-1865) regarding the erection of the National Monument 1813 at The Hague, dated Nov. 1st 1871. Written in a legible hand on 1 side of a folded 4° sheet of mourning stationary (his daughter Louise died that year in March). -- Also added: Unused stationary of Prince Alexander of the Netherlands (1851-1884). Folded 8° sheet of paper w. blindstamp and 2 watermarks, one of which is a portrait of the Prince. -- (3).